Build targets for Linux static library

I am developing a C++ library for x86 or x64 Linux server programmers. The library is not open sourced and the compiled output shall be static library(.a) files.

Which build targets should I consider for most server programmers? So far, I am considering these:

• GCC and CLANG
• x86, x86_64
• debug (assert is turned on, no optimized code), release (assert is turned off) [1]

The total combination shall be 2*2*2 = 8.

Are these enough? Should I consider Ubuntu and CentOS?

[1] I have used assert() instead of run-time junction (code below) only for some performance-sensitive functions. In other cases, I use runtime junction. Runtime junction is more needed for production code, but it cause performance impact to very frequently called functions. For example, executing two junction instructions and accessing m_length takes longer time than accessing array data only.

#define runtime_assert(x); { if (g_enableAssert && !(x)) ShowError(#x); }

#ifdef _DEBUG
#define assert(x) runtime_assert(x)
#else
#define assert(x) 0
#endif

bool g_enableAssert = true;

class Array
{
    int m_length;

    // doing runtime junction
    void Set(int index, int value)
    {
        runtime_assert(index>=0 && index<m_length);
        ...
    }

    // using assert
    void Set(int index, int value)
    {
        assert(index>=0 && index<m_length);
       ...
    }
}

Copyright Notice：Content Author:「Hyunjik Bae」，Reproduced under the CC 4.0 BY-SA copyright license with a link to the original source and this disclaimer.
Link to original article：https://stackoverflow.com/questions/28037263/build-targets-for-linux-static-library